openscap filters

I would like to know if it is possible to generate an openscap's report that includes only the security critical patches.

The report generated with:
$ oscap oval eval --verbose INFO --verbose-log-file=output.log --results rhsa-results-oval.xml --report oval-report.html Red_Hat_Enterprise_Linux_6.xml

Is quite good, but I would like to filter the report based on the severity field.
Any thoughts?

Thanks.